What encoding method did it use? 4&4 or 6&2?
I'll assume 6&2?
6&2.
pretty good.
However, there was no reason why the same performance (but
not density) couldn't be achieved with standard sectors. The Apple ///
SOS disk driver pioneered this, and IIRC Prodos did it as well.
Sure, read the raw track into a buffer in memory and then process it. The
only drawback is the requirement for a relatively large buffer.
No, the trick (as used in SOS, and in the Lisa I/O card ROM) is to
do 1:1 interleave *without8 a track buffer. They directly denibblize
as they're reading the bits from the disk.